Tuning-coil and condenser mounting for radioreceivers



ept'. S, i925 E' (ll. rfJlW/E TUNING COIL AND CONDENSER MOUNTNG FOR RADIORECEIVEHS Fild pril 29, 1924 sept. s. 1925.] y '1,552,882 C, RCWE TUNING COIL AND CONDENSER MOUNTING FOR RADIORECEIVERS Filed April 29. i924 s sheets-'sheet 2 Sept 8, 1925. 1,552,883,

TUNING COIL AND CONDENSER MOUNTING FOR RADIORECEIVERS Filed April 29 192.4 3 SheetS-Shnk-'S Z'CQ/Owe atto z 14,0114

Patented Sept. 8, 1925.

FRANK C. ROWE, OF MOUNT CLARE, WEST VIRGINIA.

TUNING-COIL AND CONDENSER MOUNTING FOR RADIORECEIVERS.

Application filed April 29, 1924. Serial No. 709,824.

To all whom 'it may concern.'

Be it known that I, FRANK C. Rows, a citizen ot' the United States, residing at Mount Clare, in the county of Harrison and State of lVest Virginia, have invented certain new and useful Improvements in a Tuning-Coil and Condenser Mounting for Radioreceivers, of which the following is a specification.

This invention relates to improvements in 'radio receiving sets, and particularly to combined coil and condenser mounting therefor.

An object of the invention resides in providing mountingvtor the movable and stationary coils of a tuning inductance, in'

which the movable coils are positioned between airs of stationary coils at opposite sides tiereof, and connected in series with said movable coil, through a plurality of condenser contactpoints carried by the mounting `for the movable coil, and stationary brushes having contact with said plate, the condenser plates acting to eliminate set noises er other local interferences and in crease the tuning qualities of the ind uctances, in addition to providing; a convenient means of making contacts between the movable and stationary coils.

'Another object of the invention resides in providing a combined tuning inductance and condenser mountinw, for radio receiving sets, wherein primary and stationary inducta-nce coilsl are separated into sectionsconnected 1n lseries, and in which certain et said sections are carried on a movable mounting element arranged between a pair of stationary mounting elements carrying the stationary portions of the coil, in relative inductive -relation, a plurality of contact condenser plates being provided on the mov able mounting element arranged on the axis of rotation thereof, and with which contact a plurality of brushes arranged in', predetermined relation, for connecting the several coil sections of the primary and seconda-ry 'in series, and at the same time providing a means for reducing local interference to a minimum, and a. tuning condenser being inl eluded in the prima-ry circuit, and mounted in the movable mounting element, having a plurality of relatively rotatable plates, Awhich cooperation with the stationary plates of the condenser, when used for tuning purposes.

A further object of the invention resides in providing a combined tuning inductance and condenser mounting for radio receiving sets, wherein the tuning induetanee includes primary and secondary windings, each'o which is divided into a plurality of sections, eertain of which are mounted on a movable mounting element positioned between a. pair of stationary mounting elements so that the rotation of the movable mounting elements for tuning the primary will effect a corresponding tuning action of t'he secondary simultaneously therewith, in order that the inductive relation of the primary land secondary may be balanced, a. plurality of Contact condenser plates being mounted on the movable mounting element, at rightangles to the axis of movement thereof, with which contacts a plurality of brushes, which are used for nterposing` the several sections ot' the primary and secondary windings in circuit, in a predetermined relation, and a` variable'condenser also arranged in series in the primary circuit, for tuning purposes, having the rotary control shaft, for varying the capacity thereof arranged in axial alignment with the control for rotating the movable mounting element, in order that the controls for the tuning devices ot' the set may be centralized for/convenient operation, and a cooperation in tuninn' and elimination 'of set noises.

The invention also comprehends other objects and improvements in the details of c0nstruction and arrangement of parte which are more particularly pointed out in the following description and claims, directed to a pret-erred form ot' the invention, it being understood however, that variations may be made in this specific construction, Without departing from the spirit and scope of the invention as described and claimed.

In the drawing, forming a part of this application Eigure l is a plan view of the invention in assembled relation.`

Figure 2 is a sectional View, taken en the line 2-2 of Figure 1.

Figure 3 is a detail sectional view` on an enlarged scale, taken on the line 3-3 of Figure l.

Sil

Figure '1 is another detail enlarged seetionel View, taken on the line 5r-Jl: of Figure 1.

Figure 5 is an enlarged detail View et' the condenser Contact plete, teken on the line 5.5 o Figure l.

Figure 6 is o. wiring diagram, shoWinfY the connection between the condenser an the primary and secondary windings.

A pulir of panels or mounting plates are indicated et l and 2 respectively, het-Ween the outer endsA of which are mounted L pair of stationery tubular coil mountngs 3, in axial spaced'reletion. Each of these mountings 3, are provided with a, pair of spaced coil windings 4l and 5 respectively, the wind-- ing -l beingn the stationery rtion of the secondary Winding, While t e windings 5 are stationary portions of the primary windings. The ends of the coils 5 are elecu tricelly connected to screws 6 and 7 reispee` tively, which extend through the panel section 2 und provide a Ineens of mounting the tubes 3, in spaced relation with Suid panel section, While screws 8 have one end of the coil l connected thereto and extend through the panel section l, for mounting binding posts 9 on the out/er ends thereof. adapted for r iving proper connections ior iuterposing this coil in the receiving circuit el the eet. The other end portions of the windings l are electrically connected with screws l0., which are secured to Contact .stripe ll .mounted on the panel l, the screws u und l0, und trips 1l, serving to properly.7 mount the tube section in proper relation Withithe panel l, in order to .torni u, 'unit assembly. A movable coil mounting includes 2L main tubular member l2 of equal size with reepect to 'the tube 3, und rotaiul le therein, on en exile extending transversely' to the finie of the tubes iii, tnrough the medium ot hem.- ing broeken, i3, mounted in diiunetrieallv opposite sides o the central. portion ci? the tubew which ure rotatuhlc on tuhulur shaft members Ll und i respcctivcly. tho simil member l5 having' u hearing in the hc. :ing1 sleeve 1G, rieti by the princi, The mum tulle l2 is provided with poire of spaced windings l? und 18 roepcclirely, the windings li' included in the primary circuitv` While the Windinge 18 :1re second-arg.' windings, included in thc corresponding cir cuit with the secondary windings on the tube 'A pair of Contact condenser pluies are indicated at ll) und 2O respectively, mounted, between the tube l2 and the punel l, in spaced concentric relation with the tubular shaft i4 on 1die :=f =zo\.7 nuuihcre 2i and 22 reepeetively, The ser 2l und 22 are carried by the tube lf3 sind the ecreWe-Ql mount the Contact plate or (liso if) in spaced relation thereto, und said plate if) 'formed with openings 23, through which page screws Q2 which mount the Contact plate 20,

nemesi! in spaced relation with the plate 19 and the panel l, the pluies being electrically insulated from one another in said spaced relation.

`Another Contact plate is indicated at 2e, which is of annuler form, formed 'with u central opening to receive the tubular sind(v lo in spaced relation therein, and which is. mounted on screw members 25, in spaced relation with the tube 12 and panel section 2, for rotation with the tube 12. The 1. 'indings 18 on the main movable tube l2 euch have one end electrically connected to the contact plates 19 und 20, through the screws 2l, and respectively. while the windings l? euch have one end connected to the Contact plete 24 through thc Screws Q5 und the other end connected to the hearing sleeve 16, wlwich is rotfitzihle in the panel 2, and conne ed to the tuhcs l2 by suituble screw nieinoers 26, which extend through the elongated opening formed in the Contact pluto 24', which hczsring' slccrc is adopted lo 'l'oriu the operating menus for receiving u manually opcruhle diul or houille., l'or operutir rotul'il'uf (he Luhe iu the tuning ope i ik Screw iuemhcr 2i c i'tcude through the puucl l mul mounts ou (he outer luce thcreo. u hiudiug poel; 2S?, und ult the inner end e parir ot connut :mus LSl'f :ulupted to si'ruddle the couluct lie-u lu, und provide electrical connection therewith. the hinding post 28 receiving' the connection ol the Seconde-.1y circuit oi u receiving uppuratus.

A pair otcoutuct hrueheev 3G are connected lo the panel l. hy u suilulile connection, which extends through thc contact strips ll, und provide electricul connections hot-Ween the brushes 30 and the Contact Strips 'il7 so thut :L circuit will he nuidc hctwcen the movable und Staliouuiv seconden-j.' coil Windinf':

udiipted to connect (hein in scrics in the ceiving circuit.

Brushes 3l, iuouulccl ou lhc puuci SW 'tions 2 hy euituhle .esci-uws :1ro el; connected with the scrmss o ln' stri Huituhle inclol. the hrusshce coulucl' y 'the disc 2l which provides electrical ncclion between the primair); wiudiufijf; ll' on the luhc l2 und lhe tulifumrj/ priumrj; windings; 5 oujihe uliee il. which ure pliiccd in the circuit hctwccn'lhc ucriul und the ground in e manner to lic llescriliczl, the ground crumectiou being prcl'eruhly inode with the Screws 'l'. l

il. supplemental momhl tulle is M5523, ol' a diameter smaller then the moin ruhe l2, und which in 'positioned Within Seid main tulle und rotatably mounted in axial relation therewith, on the tuhulur shaft l5, :it one side'und the tubular Shaft Section l et the otherh -Slide, the Shafts l5 und bearing sleeve '1G being in electrical communication tor purposes which will presently appear. The supplemental tube is provided with lll) 'lOfS ifo indicutecl [and 39,'the rods 39 having a relatively ro- :tatable' extension 40 connected thereto, having bearing in the panel 1 and which forms *the mounting in said panel., for the movable 'tubes l2 and 33 and the remaining struetu re kconnected tlierewitli. A coil spring fil, is positioned under compression between an insulating sleeve 42 and a collar l/3, on the "rod extension lll), for holding said sleeve in fend oi? the rod 39 recel-ves and mounts a -bar member 4s, the ends of which are atftached to the ends of the bracket extensions C355 and through which vextend elongated bearing contact with the panel l. The inner screws 45, which mount a plurality ol stautionfir i condenser rlates 4G in smc-eil relation between the bar member fifi and the har member 47, arranged 1n spaced relation therewith, and'y connected at the opposite "endsof the screws and supported on the rod 38, in the central portion thereof. The

.end oil the rod/38 rotatably'seat in the end portion of tbe rod portion 39 in a manner @clearly shown in *Figure and mounts a plurality of Amovable,condenser plates 1lb adapted for cooperation with the stationary plate-p16, to provide. a variable condenser structure 4Within the supplemental tube 32%, lrecoller adjustably mounted on the rod and adapted to contact with the ends oi the insulating sleeve ilo, tor retaining` the `end ofthe Arod B8 in its bearing relation in the socket formed in the end'or the rod 30. The supplemental tubev is retained on theend portions of the ytubular shafts l5 and 14 respectively, by a suitable nut 49, screw `threaded `on portions of said shaft, in a manner clearly shown in Figure 2.

The circuit from one lside of the windings Bil on tire tube 33, lbeing connected with tbe extensirnis S5 provide an electrical circuit to thestationary condenser plates 46, which is completed through the movable condenser plates and the shafts l. which connect it to the nrrial or ground side of the circuit as desired, 'for interposingthe primary wind ing; in series with the variable condenser in the ,untennita ground circuit of the ceiving4 set.

Upon examining the wiring diagram, in Figure 6, the circuit connect-ions 'lor the several coils on lthe movable tubes l2 and 33 as well as the stationary 'tubes 8 may' be readily ascertained, from which it will be cles r how the unit assembly of variable condensers and tuning inductance is used in the radio receivingy circuit.

ln this construction, it will he seen that by mounting` the variable condenser within the tube 33, the adjustment Ylor the movable plates is in axial alignment with the adjustment or means 'for rotating` the tubes l2 and El?) relative to one another and the stationary tube 3, so that the controls or adj listino` dials for thc sev-eral movable parts, may ,be arranged in axial aligi'lment, and sulierposed relation in order that a convci'iient adjustment between the several parts may be ciiiected. The association ol the several elements in the manner illustrated, will also increase the inductive relation and amplification of the signals received in the Secondary windings oit the construction. The contact plates i9, 2O and 2i will not only act a lshield for elin'iinatingf internal set noises, but the ]')latc's i9 and Q() will also have a rifondenscr action. in cooperation with the inductive winding of the coils, which will be ol' a substantially permanent character.

The construction above described 'forms an assembled unit7 which is adapted to be mounted on an instrument panel of the receiving set, through the medium oli' the screws l, extending through said panel, and receiving Asuitable nuts 'for mounting the as sembly on `the paneln The sleeve lf3, tubular shaft l5, and rod 3S, extending through an opening in the instrument panel ot the set, (not shown). in liront of which the sleeves, shaft and rod are adapted to receive the operating dials, through which the operation olC the movable coils and the condenser may be eliccted. and the position oi' adjustment ascertained.

From this construction` it will be seen that a unit assembly has been provided for thel primary and secondary windings, Well as a variable condenser, portions ot both the primary and secondary windings being arranged on the movable tube for relative rotation and tuning' adjustment with respect 'to the stationary portions of the winding, in a single operation of one ad'iustment, while the primary Winding has an additional movable coil, adapted for adjustment, relativo to both the stationary windings and the movable portions oi the secondary, as well as' other portions of the primary windings, during; the tuning operation of the receiving;n set, in 'which it is interposed. forefectively vtuning the same to receive a desired signal.

llhat is claimed is:

l.. A tuning coil assembly comprising a pair of spaced tubular stationary coil niountings, arranged in axial alignment, is tubular coil mounting rotatably mounted between and on an axis substantially at right angles to the axes of the stationary mount-ings, and adapted to be positioned in windings are land .between said panel axial alignment with said stat carri tionarylbruslies engaging seid plates, pri' -Inary windings niounte ionary mountings, aA plurality of contact condenser plates ed y the rotatable coil mounting, staand stationary coil mounting tubes, and connected in series throu l1 said contact condenser -plates and bruses respectively, and seconder windings mounted on said movable an stationary tubes respectively, inductively arranged relative to the primary windings' and also connected inseries through .the contact condenser plates` and brushes.

2. A tuning coil assembly comprising a pair of spaced panel sections, a pair of stationary tubes mounted on and .between said channel sectionsv in spaced relation, a main rotatable tube mounted between said sta# tionary tubes and the panels, having means for rotatably supporting said tube sections on an axis at right angles to said panels, a plurality of contact plates mounted in s aced relation betweeny the main tube and tile anels, stationary contact brushes carried y the panels engaging said plates, Said main tube being provided with a plurality of coil windings arranged .in spaced relation and electrically connected with said contact plates, said stationary tubes being provided with pairs of coil windings, certain of the coils on the main tube and stationary tube being connected in series through thecontact plates and brushes, to form a primary circuit, while the remaining adapted for lconnection through said plates and brushes, in series, to form secondary windin s. y

8. A tuning coil an condenser-assembly comprising a pair of spacedpanel Sections, a pair of stationary tubesinounted on sections in spaced relation, amain rotatable' tube mounted between said stationary tube and the panels,

means for rotatably supporting said main,-

on the movable` n said plates,

rotatable tube on an axis at right angles to said panels, a plurality of contact lates mounted invspaced relation between t e r0- tatable tube 'and the panels, stationary contact brushes carried by the panels engaging said main tube being provided with a plurality of coil windings arranged in spaced relation and electrically connected with said contact plates, said stationair tubes being provided with pairs of coilwindings, certain of the coils of the main tube and stationary tube being connected in series through the contact plates and brushes,

the remaining windings are adapted'for connection through said/plates and brushes, in

series, to form secondary windings, a sleeve .member-mounted in said main tube and rotatably mounted in one 'of said panels, in axial .relation with the axis of rotation of said main tube, adapted for receivin means for the adjustment. of the main tube 01' tuning purposes, a supplemental tube having a sleeve extension therefrom extending through the sleeve 'on the main tube and rotatable therein, insulating means being interposed between said supplemental tube being adapted for rotation relative to the main, tube, through the tubular extension thereon, a 'variable condenser mounted in saidt supplemental tube, a shaft extending through the tubular shaft of the supplemental tube and msu- Alated therefrom, for varying the. capacity. of said variable condenser, centralizing Athe control for ,the movable tubesv and the variable condenser, in axial-arrangement, said supplemental tube having coil windin thereon, connected in series with thev 'coil windings of the` main' tube and the variablecondenser, adapted cuit therewith.

In testimony 'whereof I aiix my signature.

FRANK C. Rowe.

to form the primary cirto form a primary circuit, while' the tubular. extensions, 

